From c0e959a486b0fbda6d502e8787868f512f0d2289 Mon Sep 17 00:00:00 2001
From: HadiSharifi <sharifihadi002@gmail.com>
Date: Mon, 27 Apr 2026 17:34:26 +0330
Subject: [PATCH] implement all methods in Rational file

---
 src/main/java/Rational/Rational.java | 41 +++++++++++-----------------
 1 file changed, 16 insertions(+), 25 deletions(-)

diff --git a/src/main/java/Rational/Rational.java b/src/main/java/Rational/Rational.java
index 7bd840e..b9fd677 100644
--- a/src/main/java/Rational/Rational.java
+++ b/src/main/java/Rational/Rational.java
@@ -51,48 +51,39 @@ public class Rational {
         return r1.add(r2);
     }
 
-    // TODO: Instance method - this - other
-    // Formula: a/b - c/d = (a*d - c*b) / (b*d)
     public Rational subtract(Rational other) {
-        // YOUR CODE HERE
-        return null; // Remove this line when implemented
+        int newNumerator =  this.numerator * other.denominator - other.numerator * this.denominator;
+        int newDenominator =  this.denominator * other.denominator;
+        return new Rational(newNumerator, newDenominator);
     }
 
-    // TODO: Static method - r1 - r2
     public static Rational subtract(Rational r1, Rational r2) {
-        // YOUR CODE HERE
-        return null; // Remove this line when implemented
+        return r1.subtract(r2);
     }
 
-    // TODO: Instance method - this * other
-    // Formula: (a/b) * (c/d) = (a*c) / (b*d)
     public Rational multiply(Rational other) {
-        // YOUR CODE HERE
-        return null; // Remove this line when implemented
+        int newNumerator =  this.numerator * other.numerator;
+        int  newDenominator =  this.denominator * other.denominator;
+        return new Rational(newNumerator, newDenominator);
     }
 
-    // TODO: Static method - r1 * r2
     public static Rational multiply(Rational r1, Rational r2) {
-        // YOUR CODE HERE
-        return null; // Remove this line when implemented
+        return r1.multiply(r2);
     }
 
-    // TODO: Instance method - this / other
-    // Formula: (a/b) ÷ (c/d) = (a*d) / (b*c)
     public Rational divide(Rational other) {
-        // YOUR CODE HERE
-        // HINT: Division is multiplication by reciprocal
-        // Don't forget to check if other.numerator is zero!
-        return null; // Remove this line when implemented
+        if (other.denominator == 0) {
+            throw new IllegalArgumentException("Denominator cannot be zero");
+        }
+        int newNumerator =  this.numerator * other.denominator;
+        int newDenominator =  this.denominator * other.numerator;
+        return new Rational(newNumerator, newDenominator);
     }
 
-    // TODO: Static method - r1 / r2
     public static Rational divide(Rational r1, Rational r2) {
-        // YOUR CODE HERE
-        return null; // Remove this line when implemented
+        return r1.divide(r2);
     }
 
-    //  PROVIDED - String representation
     @Override
     public String toString() {
         if (denominator == 1) {
@@ -101,7 +92,7 @@ public class Rational {
         return numerator + "/" + denominator;
     }
 
-    //  PROVIDED - Decimal value
+
     public double toDouble() {
         return (double) numerator / denominator;
     }